Assuming that the treatment worked exactly that way every time, then yes, the person could appear to be perpetually 40 (or at least, every 10 years he/she could lose 10 years off his/her looks and then continue the process of aging to what looks like 50).
However, as with most medications, there might be diminishing returns with continued usage. The more he/she uses it, the less effective it would be over time. So maybe at actual age 60 he/she uses the treatment and it only takes off 9 years instead of 10. Then the next treatment only takes off 8 years, etc...
Also, what do you mean by taking off years? Do you mean purely external physical signs of aging like wrinkles, thining hair, etc.. Or do you mean more complete physical signs including loss of body mass, decreased hormone production, etc. Such a treatment might not be effective for everyone since not everyone looks that much different between 40 and 50.
Finally, would the treatment restore the person to what he/she looked like when 10 years younger, or would it just impart a general state of 10 years youthfulness that is more or less the same for everyone; there are some people who look better at 50 than at 40. I can't think of any celebrity examples off hand but surely there might be cases of people who are overweight at 40 but manage to trim down over the course of 10 years. Would such a treatment then pack the weight back onto such a person? Imagine that perpetual cycle of weight gain that accompanies the treatment every 10 years.
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You know something, I don't think the sun even... exists... in this place. 'Cause I've been up for hours, and hours, and hours, and the night never ends here.
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